diff --git a/src/app/backend.service.ts b/src/app/backend.service.ts
index be53904bd1f0ebaaf7533eb5e82c4aed0dd15bb5..39d92b84a191768c8656e5fb417e7f7067ddf773 100644
--- a/src/app/backend.service.ts
+++ b/src/app/backend.service.ts
@@ -13,6 +13,8 @@ export class BackendService {
   private serverSlimAdminUrl = '';
   private serverSlimUrl_Close = '';
 
+  private serverUrl2 = 'http://localhost/testcenter-iqb-php/'; // TODO (BEFORE-MERGE) REMOVE
+
   constructor(
     @Inject('SERVER_URL') private readonly serverUrl: string,
     private http: HttpClient) {
@@ -103,12 +105,11 @@ export class BackendService {
         );
   }
 
-  // BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
-  lockBooklet(bookletDbId: number): Observable<boolean | ServerError> {
+
+  lockBooklet(testId: number): Observable<boolean | ServerError> {
+
     return this.http
-      .post<boolean>(this.serverSlimUrl_Close + 'lock', {b: bookletDbId})
-        .pipe(
-          catchError(ErrorHandler.handle)
-        );
+      .post<boolean>(this.serverUrl2 + `test/${testId}/lock`, {})
+      .pipe(catchError(ErrorHandler.handle));
   }
 }
diff --git a/src/app/test-controller/backend.service.ts b/src/app/test-controller/backend.service.ts
index 31045ab5e3f4ba2424ca664824c22784d4da38a6..bd224fe9c3b2df12829c0f4ace8c7d44e0040907 100644
--- a/src/app/test-controller/backend.service.ts
+++ b/src/app/test-controller/backend.service.ts
@@ -10,19 +10,13 @@ import { ServerError } from 'iqb-components';
   providedIn: 'root'
 })
 export class BackendService {
-  private serverSlimUrl_GET = '';
-  private serverSlimUrl_POST = '';
 
-  private serverUrl2 = 'http://localhost/testcenter-iqb-php/';
+  private serverUrl2 = 'http://localhost/testcenter-iqb-php/'; // TODO (BEFORE-MERGE) REMOVE
 
   constructor(
     @Inject('SERVER_URL') private serverUrl: string,
     private http: HttpClient
   ) {
-
-    this.serverSlimUrl_GET = this.serverUrl + 'php_tc/tc_get.php/';
-    this.serverSlimUrl_POST = this.serverUrl + 'php_tc/tc_post.php/';
-    this.serverUrl = this.serverUrl + 'php_tc/';
   }